Alert archive / Arizona / Flash Flood Warnings in 2012
Flash Flood Warning 50, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 21, 2012, 8:28 PM MST for Maricopa County, Arizona. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 21, 2012, 8:28 PM MST (03:28 UTC)
- Expired
- Aug 21, 2012, 10:30 PM MST
- In force
- 2 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 90 km from the middle of the area, began a volume at 03:29 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Phoenix, AZ (KPSR), launched 00:00Z, 3.5 hours before the alert went out and 65 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 565 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 2143 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
246 WGUS55 KPSR 220328 FFWPSR AZC013-220530- /O.NEW.KPSR.FF.W.0050.120822T0328Z-120822T0530Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 828 PM MST TUE AUG 21 2012 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * FLASH FLOOD WARNING FOR... WEST CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA... * UNTIL 1030 PM MST * AT 820 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED NEARLY STATIONARY THUNDERSTORMS PRODUCING VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING. RADAR ESTIMATES UP TO ONE INCH HAS FALLEN IN THE LAST 20 MINUTES. * LOCATIONS IN THE WARNING INCLUDE STATE ROUTE 85 BETWEEN COTTON CENTER AND BUCKEYE NEAR THE RAINBOW WASH. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOST FLOOD DEATHS OCCUR IN MOTORIZED VEHICLES. WHEN ENCOUNTERING FLOODED ROADS...MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. && LAT...LON 3333 11268 3333 11253 3314 11258 3317 11273 $$ NOLTE
3 follow-up statements
443 WGUS75 KPSR 220349 FFSPSR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 849 PM MST TUE AUG 21 2012 AZC013-220530- /O.CON.KPSR.FF.W.0050.000000T0000Z-120822T0530Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MARICOPA AZ- 849 PM MST TUE AUG 21 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM MST FOR WEST CENTRAL MARICOPA COUNTY... AT 843 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED AN AREA OF THUNDERSTORMS PRODUCING VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING. PRECIPITATION GAUGE LOCATED AT RAINBOW WASH NEAR STATE ROUTE 85 HAS MEASURED OVER ONE AND ONE QUARTER INCHES OF RAIN IN THE LAST THIRTY MINUTES. ADDITIONAL GAUGES IN THE AREA ARE REPORTING UP TO ONE HALF INCH OF RAIN NEAR BUCKEYE AND GOODYEAR ON THE PERIPHERY OF THE WARNING AREA. STORMS CONTINUE TO REMAIN STATIONARY OVER THE AREA...CONTINUING THE THREAT FOR FLASH FLOODING DUE TO HEAVY RAINFALL. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOST FLOOD DEATHS OCCUR IN MOTORIZED VEHICLES. WHEN ENCOUNTERING FLOODED ROADS...MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. && LAT...LON 3333 11268 3333 11253 3314 11258 3317 11273 $$ NOLTE
435 WGUS75 KPSR 220413 FFSPSR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 913 PM MST TUE AUG 21 2012 AZC013-220530- /O.CON.KPSR.FF.W.0050.000000T0000Z-120822T0530Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MARICOPA AZ- 913 PM MST TUE AUG 21 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM MST FOR WEST CENTRAL MARICOPA COUNTY... AT 907 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO MONITOR AN AREA OF MOSTLY STATIONARY THUNDERSTORMS PRODUCING HEAVY RAINFALL ACROSS PORTIONS OF WEST CENTRAL MARICOPA COUNTY. RAIN GAUGE AT RAINBOW WASH HAS MEASURED OVER ONE AND THREE QUARTER INCHES OF PRECIPITATION OVER THE LAST HOUR. RAINBOW WASH IS REPORTED TO BE RUNNING IMPACTING OLD US 80 AND POTENTIALLY STATE ROUTE 85 AS WELL. RADAR INDICATES THUNDERSHOWERS CONTINUE ACROSS MUCH OF THE AREA...ALLOWING FOR ADDITIONAL RAINFALL ACCUMULATIONS ACROSS THE WARNING AREA. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOST FLOOD DEATHS OCCUR IN MOTORIZED VEHICLES. WHEN ENCOUNTERING FLOODED ROADS...MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. && LAT...LON 3333 11268 3333 11253 3314 11258 3317 11273 $$ NOLTE
773 WGUS75 KPSR 220527 FFSPSR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 1027 PM MST TUE AUG 21 2012 AZC013-220535- /O.EXP.KPSR.FF.W.0050.000000T0000Z-120822T0530Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MARICOPA AZ- 1027 PM MST TUE AUG 21 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 1030 PM MST FOR WEST CENTRAL MARICOPA COUNTY... RAINFALL ACROSS THE RAINBOW WASH DRAINAGE TOTALED BETWEEN ONE AND THREE QUARTER INCHES TO OVER TWO INCHES ACROSS THE AREA THIS EVENING. FLOW HAS BEEN REPORTED IN RAINBOW WASH AND IMPACTS ASSOCIATED WITH HEAVY RAINFALL WILL CONTINUE FOR THE NEXT FEW HOURS. AVOID DRIVING THROUGH WATER COVERED ROADWAYS...ESPECIALLY AT NIGHT. REMEMBER...TURN AROUND DO NOT DROWN. LAT...LON 3333 11268 3333 11253 3314 11258 3317 11273 $$ NOLTE
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 5:10 PM MST | Special Weather Statement | PSR | La Paz | 80 min |
| Aug 21, 5:29 PM MST | Special Weather Statement | PSR | Pinal | 46 min |
| Aug 21, 5:37 PM MST | Flash Flood Warning | PSR | La Paz | 83 min |
| Aug 21, 5:55 PM MST | Severe Thunderstorm Warning | PSR | La Paz | 65 min |
| Aug 21, 5:59 PM MST | Special Weather Statement | PSR | Maricopa | 76 min |
| Aug 21, 6:00 PM MST | Severe Thunderstorm Warning | PSR | La Paz | 39 min |
| Aug 21, 6:09 PM MST | Special Weather Statement | PSR | Pinal | 51 min |
| Aug 21, 6:12 PM MST | Flash Flood Warning | PSR | La Paz | 71 min |
| Aug 21, 6:51 PM MST | Flash Flood Warning | PSR | La Paz | 75 min |
| Aug 21, 6:56 PM MST | Areal Flood Advisory | PSR | Gila, Maricopa, Pinal | 3 hr |
| Aug 21, 6:57 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 33 min |
| Aug 21, 7:03 PM MST | Blowing Dust Advisory | PSR | 57 min | |
| Aug 21, 7:05 PM MST | Flash Flood Warning | PSR | Pinal | 55 min |
| Aug 21, 7:09 PM MST | Special Weather Statement | PSR | La Paz | 66 min |
| Aug 21, 7:30 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 30 min |
| Aug 21, 7:37 PM MST | Special Weather Statement | PSR | Maricopa | 53 min |
| Aug 21, 7:49 PM MST | Areal Flood Advisory | PSR | La Paz | 90 min |
| Aug 21, 8:00 PM MST | Flash Flood Warning | PSR | Pinal | 30 min |
| Aug 21, 8:16 PM MST | Areal Flood Advisory | PSR | Maricopa | 119 min |
| Aug 21, 9:02 PM MST | Areal Flood Advisory | PSR | Maricopa | 118 min |
| Aug 21, 9:32 PM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 118 min |
| Aug 21, 9:53 PM MST | Special Weather Statement | PSR | 37 min | |
| Aug 21, 10:07 PM MST | Special Weather Statement | PSR | Yuma | 38 min |
| Aug 21, 10:24 PM MST | Blowing Dust Advisory | PSR | 3 hr | |
| Aug 21, 10:40 PM MST | Areal Flood Advisory | PSR | La Paz | 81 min |
| Aug 21, 10:54 PM MST | Special Weather Statement | PSR | 66 min | |
| Aug 21, 11:15 PM MST | Special Weather Statement | PSR | La Paz | 75 min |
| Aug 22, 1:34 PM MST | Flash Flood Watch | PSR | 15 hr | |
| Aug 22, 1:44 PM MST | Flash Flood Warning | PSR | Maricopa, Pinal | 3 hr |
| Aug 22, 2:32 PM MST | Areal Flood Advisory | PSR | Maricopa | 118 min |
Nearby
Flash Flood Warnings in Arizona, 2012Every flash flood warning in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.